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Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. This project includes GWT-friendly sources.

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/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.base;

import static jsinterop.annotations.JsPackage.GLOBAL;

import java.util.concurrent.TimeUnit;
import jsinterop.annotations.JsMethod;
import jsinterop.annotations.JsType;
import org.checkerframework.checker.nullness.qual.Nullable;

/** @author Jesse Wilson */
final class Platform {
  static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
    // CharMatcher.precomputed() produces CharMatchers that are maybe a little
    // faster (and that's debatable), but definitely more memory-hungry. We're
    // choosing to turn .precomputed() into a no-op in GWT, because it doesn't
    // seem to be a worthwhile tradeoff in a browser.
    return matcher;
  }

  static long systemNanoTime() {
    // System.nanoTime() is not available in GWT, so we get milliseconds
    // and convert to nanos.
    return TimeUnit.MILLISECONDS.toNanos(System.currentTimeMillis());
  }

  static > Optional getEnumIfPresent(Class enumClass, String value) {
    try {
      return Optional.of(Enum.valueOf(enumClass, value));
    } catch (IllegalArgumentException iae) {
      return Optional.absent();
    }
  }

  static String formatCompact4Digits(double value) {
    return "" + ((Number) (Object) value).toPrecision(4);
  }

  @JsMethod
  static native boolean stringIsNullOrEmpty(@Nullable String string) /*-{
    return !string;
  }-*/;

  @JsMethod
  static native String nullToEmpty(@Nullable String string) /*-{
    return string || "";
  }-*/;

  @JsMethod
  static native String emptyToNull(@Nullable String string) /*-{
    return string || null;
  }-*/;

  @JsType(isNative = true, name = "Number", namespace = GLOBAL)
  private interface Number {
    double toPrecision(int precision);
  }

  static CommonPattern compilePattern(String pattern) {
    throw new UnsupportedOperationException();
  }

  static boolean patternCompilerIsPcreLike() {
    throw new UnsupportedOperationException();
  }

  private Platform() {}
}